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Identification of Distinct Functional Microstructural Domains Controlling C Storage in Soil

Steffens, Markus and Rogge, Derek M. and Mueller, Carsten W. and Höschen, Carmen and Lugmeier, Johann and Kölbl, Angelika and Kögel-Knabner, Ingrid (2017) Identification of Distinct Functional Microstructural Domains Controlling C Storage in Soil. Environmental Science & Technology, 51 (21), pp. 12182-12189. American Chemical society (ACS). DOI: 10.1021/acs.est.7b03715 ISSN 0013-936X

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Official URL: http://pubs.acs.org/doi/10.1021/acs.est.7b03715

Abstract

The physical, chemical, and biological processes forming the backbone of important soil functions (e.g., carbon sequestration, nutrient and contaminant storage, and water transport) take place at reactive interfaces of soil particles and pores. The accessibility of these interfaces is determined by the spatial arrangement of the solid mineral and organic soil components, and the resulting pore system. Despite the development and application of novel imaging techniques operating at the micrometer and even nanometer scale, the microstructure of soils is still considered as a random arrangement of mineral and organic components. Using nanoscale secondary ion mass spectroscopy (NanoSIMS) and a novel digital image processing routine adapted from remote sensing (consisting of image preprocessing, endmember extraction, and a supervised classification), we extensively analyzed the spatial distribution of secondary ions that are characteristic of mineral and organic soil components on the submicrometer scale in an intact soil aggregate (40 measurements, each covering an area of 30 μm × 30 μm with a lateral resolution of 100 nm × 100 nm). We were surprised that the 40 spatially independent measurements clustered in just two complementary types of micrometer-sized domains. Each domain is characterized by a microarchitecture built of a definite mineral assemblage with various organic matter forms and a specific pore system, each fulfilling different functions in soil. Our results demonstrate that these microarchitectures form due to self-organization of the manifold mineral and organic soil components to distinct mineral assemblages, which are in turn stabilized by biophysical feedback mechanisms acting through pore characteristics and microbial accessibility. These microdomains are the smallest units in soil that fulfill specific functionalities.

Item URL in elib:https://elib.dlr.de/114614/
Document Type:Article
Title:Identification of Distinct Functional Microstructural Domains Controlling C Storage in Soil
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Steffens, Markusmarkus.steffens (at) fibl.orgUNSPECIFIED
Rogge, Derek M.uderzo (at) hotmail.comUNSPECIFIED
Mueller, Carsten W.Lehrstuhl für Bodenkunde TU MünchenUNSPECIFIED
Höschen, CarmenLehrstuhl für Bodenkunde TU MünchenUNSPECIFIED
Lugmeier, JohannLehrstuhl für Bodenkunde TU MünchenUNSPECIFIED
Kölbl, AngelikaLehrstuhl für Bodenkunde TU MünchenUNSPECIFIED
Kögel-Knabner, IngridLehrstuhl für Bodenkunde TU MünchenUNSPECIFIED
Date:2017
Journal or Publication Title:Environmental Science & Technology
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:51
DOI :10.1021/acs.est.7b03715
Page Range:pp. 12182-12189
Publisher:American Chemical society (ACS)
ISSN:0013-936X
Status:Published
Keywords:Soil, XRD, NanoSIMS, carbon
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):Vorhaben Spectroscopic Methods in Remote Sensing
Location: Oberpfaffenhofen
Institutes and Institutions:German Remote Sensing Data Center > Land Surface
Deposited By: Heiden, Dr.rer.nat. Uta
Deposited On:27 Nov 2017 10:09
Last Modified:06 Sep 2019 15:25

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